/*
 * Copyright (c) 2012 Jason Polites
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.bupt.library.pinch2zoom;

/**
 * @author Jason Polites
 */
public class MoveAnimation implements Animation {

    private boolean firstFrame = true;

    private float startX;
    private float startY;

    private float targetX;
    private float targetY;
    private long animationTimeMS = 100;
    private long totalTime = 0;

    private MoveAnimationListener moveAnimationListener;

    /*
     * (non-Javadoc)
     * 
     * @see
     * com.polites.android.Animation#update(com.polites.android.GestureImageView
     * , long)
     */
    @Override
    public boolean update(GestureImageView view, long time) {
        totalTime += time;

        if (firstFrame) {
            firstFrame = false;
            startX = view.getImageX();
            startY = view.getImageY();
        }

        if (totalTime < animationTimeMS) {

            float ratio = (float) totalTime / animationTimeMS;

            float newX = ((targetX - startX) * ratio) + startX;
            float newY = ((targetY - startY) * ratio) + startY;

            if (moveAnimationListener != null) {
                moveAnimationListener.onMove(newX, newY);
            }

            return true;
        } else {
            if (moveAnimationListener != null) {
                moveAnimationListener.onMove(targetX, targetY);
            }
        }

        return false;
    }

    public void reset() {
        firstFrame = true;
        totalTime = 0;
    }

    public float getTargetX() {
        return targetX;
    }

    public void setTargetX(float targetX) {
        this.targetX = targetX;
    }

    public float getTargetY() {
        return targetY;
    }

    public void setTargetY(float targetY) {
        this.targetY = targetY;
    }

    public long getAnimationTimeMS() {
        return animationTimeMS;
    }

    public void setAnimationTimeMS(long animationTimeMS) {
        this.animationTimeMS = animationTimeMS;
    }

    public void setMoveAnimationListener(MoveAnimationListener moveAnimationListener) {
        this.moveAnimationListener = moveAnimationListener;
    }
}
